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Mid-infrared emission from laser-induced breakdown spectroscopy.

Clayton S-C Yang1, Ei E Brown, Uwe H Hommerich

  • 1Battelle Eastern Science and Technology Center, Aberdeen, Maryland 21001, USA. clayton.yang@us.army.mil

Applied Spectroscopy
|March 29, 2007
PubMed
Summary

This study reports mid-infrared (MIR) molecular emissions during laser-induced breakdown spectroscopy (LIBS) for the first time. This novel approach expands LIBS capabilities beyond elemental analysis into molecular detection.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) is a widely used technique for elemental analysis.
  • LIBS typically focuses on ultraviolet-visible-near-infrared (UV-VIS-NIR) spectral regions (< 1 micrometer).
  • Mid-infrared (MIR) molecular emissions from LIBS events have not been previously reported.

Purpose of the Study:

  • To investigate and report mid-infrared (MIR) molecular vibrational and rotational emissions from a laser-induced breakdown spectroscopy (LIBS) event.
  • To explore the potential of MIR emission as a complementary diagnostic tool for LIBS.

Main Methods:

  • Performed LIBS experiments targeting the mid-infrared (MIR) spectral range (3 to 5.75 micrometers).
  • Analyzed the generated plasma emissions using spectroscopic methods.
  • Identified molecular vibrational emission features.

Main Results:

  • Successfully detected and characterized mid-infrared (MIR) molecular emissions during a LIBS event.
  • Observed CO2 and CO vibrational emission features between 4.2 and 4.8 micrometers.
  • Attributed these emissions to the oxidation of sputtered carbon species and atmospheric oxygen.

Conclusions:

  • Mid-infrared (MIR) emission detection is feasible in laser-induced breakdown spectroscopy (LIBS).
  • LIBS MIR emission provides molecular information, augmenting traditional elemental analysis.
  • This technique holds potential for enhanced sample characterization and contaminant detection.